Rapid template-free synthesis of an air-stable hierarchical copper nanoassembly and its use as a reusable catalyst for 4-nitrophenol reduction

A hierarchical copper nanoassembly was synthesized by solvothermal treatment at 150 °C for 2 h in the absence of any templating agents, and exhibited excellent air-stability, antioxidative properties and catalytic reduction of 4-nitrophenol.